Hysteretic Behavior Of Steel Column Base With Slip-friction Arc Endplates

Steel structure has obtained a widely application in the high level seismic risk area because of its excellent performances in previous earthquakes.However,in the 1994 Northridge Earthquake in the United States and the 1995 Hanshin Earthquake in Japan,traditional rigid column base connections have been damaged to varying degrees,and the cost of repair or demolition after the earthquake is very high.Therefore,it is of great scientific and engineering significance to carry out research on seismic damage control design in time to reduce the loss of earthquake disasters.Relying on the project of NSFC “Research on seismic performance of steel frame structure with internal continuous column-column end slip-friction connection based on damage control[51878522]”,a new type of column base connection of arc plate and dissipating energy by slip-friction is proposed in this paper,which aims to replace the yielding energy of the traditional column base connection by the sliding friction energy between the arc plates and the bolt,thus achieving the design goal of lossless energy dissipation.In this paper,the hysteretic behavior of steel column base with slip-friction arc endplates is studied.The main contents include:(1)This article briefly reviews the research and application status of column base and sliding friction connections at home and abroad.(2)The working principle of steel column base with slip-friction arc endplates and two design schemes of “concave” and “convex” are described.And the process of fine modeling of the column base is briefly introduced.(3)Considering the different axial compression ratios,the hysteretic behavior of the “concave” connection is systematically studied.The research shows that the M-?curve of the “concave” connection is relatively messy,basically parallelogram,the coincidence degree of each level is not high,the rotation center drifts during loading,and there is obvious degradation of stiffness.(4)Considering the different axial compression ratios,the hysteretic behavior of the “convex” connection is systematically studied.The research shows that the M-?curve of the “convex” connection is a full parallelogram with no obvious stiffness degradation,and the superposition of each level is good,showing good energy dissipation ability.Therefore,this kind of connection can be considered to meet thedesign principle of “damage control based on minimum loss” and to achieve the design goal of lossless energy.